FFmpeg
aacsbr.h
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1 /*
2  * AAC Spectral Band Replication function declarations
3  * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
4  * Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * AAC Spectral Band Replication function declarations
26  * @author Robert Swain ( rob opendot cl )
27  */
28 
29 #ifndef AVCODEC_AACSBR_H
30 #define AVCODEC_AACSBR_H
31 
32 #include "get_bits.h"
33 #include "aac_defines.h"
34 #include "sbr.h"
35 
36 #define ENVELOPE_ADJUSTMENT_OFFSET 2
37 #define NOISE_FLOOR_OFFSET 6
38 
39 struct AACDecContext;
40 
41 /**
42  * SBR VLC tables
43  */
44 enum {
55 };
56 
57 /**
58  * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)
59  */
60 enum {
65 };
66 
67 enum {
69 };
70 
71 /** Initialize SBR. */
72 void AAC_RENAME(ff_aac_sbr_init)(void);
73 /** Initialize one SBR context. */
74 int AAC_RENAME(ff_aac_sbr_ctx_init)(struct AACDecContext *ac, SpectralBandReplication *sbr, int id_aac);
75 /** Close one SBR context. */
77 /** Decode one SBR element. */
79  GetBitContext *gb, int crc, int cnt, int id_aac);
80 /** Apply one SBR element to one AAC element. */
81 void AAC_RENAME(ff_sbr_apply)(struct AACDecContext *ac, SpectralBandReplication *sbr, int id_aac,
82  INTFLOAT* L, INTFLOAT *R);
83 
85 
86 #endif /* AVCODEC_AACSBR_H */
EXTENSION_ID_PS
@ EXTENSION_ID_PS
Definition: aacsbr.h:68
F_HUFFMAN_ENV_3_0DB
@ F_HUFFMAN_ENV_3_0DB
Definition: aacsbr.h:50
F_HUFFMAN_ENV_1_5DB
@ F_HUFFMAN_ENV_1_5DB
Definition: aacsbr.h:46
T_HUFFMAN_NOISE_BAL_3_0DB
@ T_HUFFMAN_NOISE_BAL_3_0DB
Definition: aacsbr.h:54
T_HUFFMAN_NOISE_3_0DB
@ T_HUFFMAN_NOISE_3_0DB
Definition: aacsbr.h:53
R
#define R
Definition: huffyuv.h:44
sbr.h
GetBitContext
Definition: get_bits.h:108
ff_sbr_apply
void AAC_RENAME() ff_sbr_apply(struct AACDecContext *ac, SpectralBandReplication *sbr, int id_aac, INTFLOAT *L, INTFLOAT *R)
Apply one SBR element to one AAC element.
Definition: aacsbr_template.c:1459
T_HUFFMAN_ENV_1_5DB
@ T_HUFFMAN_ENV_1_5DB
Definition: aacsbr.h:45
ff_decode_sbr_extension
int AAC_RENAME() ff_decode_sbr_extension(struct AACDecContext *ac, SpectralBandReplication *sbr, GetBitContext *gb, int crc, int cnt, int id_aac)
Decode one SBR element.
Definition: aacsbr_template.c:1093
get_bits.h
ff_aac_sbr_ctx_init
int AAC_RENAME() ff_aac_sbr_ctx_init(struct AACDecContext *ac, SpectralBandReplication *sbr, int id_aac)
Initialize one SBR context.
Definition: aacsbr_template.c:67
T_HUFFMAN_ENV_BAL_1_5DB
@ T_HUFFMAN_ENV_BAL_1_5DB
Definition: aacsbr.h:47
AACSBRContext
aacsbr functions pointers
Definition: sbr.h:121
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
T_HUFFMAN_ENV_BAL_3_0DB
@ T_HUFFMAN_ENV_BAL_3_0DB
Definition: aacsbr.h:51
SpectralBandReplication
Spectral Band Replication.
Definition: sbr.h:140
ff_aacsbr_func_ptr_init_mips
void ff_aacsbr_func_ptr_init_mips(AACSBRContext *c)
Definition: aacsbr_mips.c:612
FIXFIX
@ FIXFIX
Definition: aacsbr.h:61
AAC_RENAME
#define AAC_RENAME(x)
Definition: aac_defines.h:78
F_HUFFMAN_ENV_BAL_1_5DB
@ F_HUFFMAN_ENV_BAL_1_5DB
Definition: aacsbr.h:48
AACDecContext
main AAC decoding context
Definition: aacdec.h:186
ff_aac_sbr_ctx_close
void AAC_RENAME() ff_aac_sbr_ctx_close(SpectralBandReplication *sbr)
Close one SBR context.
Definition: aacsbr_template.c:105
T_HUFFMAN_ENV_3_0DB
@ T_HUFFMAN_ENV_3_0DB
Definition: aacsbr.h:49
L
#define L(x)
Definition: vpx_arith.h:36
FIXVAR
@ FIXVAR
Definition: aacsbr.h:62
aac_defines.h
VARFIX
@ VARFIX
Definition: aacsbr.h:63
ff_aac_sbr_init
void AAC_RENAME() ff_aac_sbr_init(void)
Initialize SBR.
Definition: aacsbr_template.c:48
F_HUFFMAN_ENV_BAL_3_0DB
@ F_HUFFMAN_ENV_BAL_3_0DB
Definition: aacsbr.h:52
INTFLOAT
float INTFLOAT
Definition: aac_defines.h:80
VARVAR
@ VARVAR
Definition: aacsbr.h:64